Potassium sulfate (K2SO4), also known as sulfate of potash, arcanite, or potash of sulfur, is a white crystalline salt which is soluble in water. This chemical compound is commonly used in fertilizers, providing plants and algae with both potassium and sulfur.
In Spirulina cultivation, K2SO4 is used in the famous Zarrouk formula which was used by NASA in the 1960s, as well as many other spirulina culturing formulas, providing spirulina with these essential growth micronutrients.
Where to Get Potassium Sulfate
K2SO4 can be difficult to find in shops, and will usually be mixed with a bunch of other minerals which aren’t necessarily needed for spirulina cultivation. So, to make things easier, here are a few suppliers that sell (almost) pure potassium sulfate in crystalline form on Amazon.
Click the image for details:
![Potassium Sulfate [K2SO4] 99% Reagent Grade Crystals 8 Oz in a Space-Saver Bottle USA](http://ws-na.amazon-adsystem.com/widgets/q?_encoding=UTF8&ASIN=B01912RMIA&Format=_SL160_&ID=AsinImage&MarketPlace=US&ServiceVersion=20070822&WS=1&tag=groworgaspir-20&language=en_US "Potassium Sulfate [K2SO4] 99% Reagent Grade Crystals 8 Oz in a Space-Saver Bottle USA")
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